well, it appears that I have loaded the modules correctly(kvm_intell is loaded). So that is not the problem.... After checking that, I heard that there is a special network driver in kvm, for the virtual machines. So I recompiled the kernel of the VMs, so that they support that virtual network driver, and tried again... Unfortunately once again the speed was very low... a little bit better than before, but still really slow.. so I gave up testing kvm and I think that my older solution(xen) is still better than kvm. Maybe they still have issues to solve in kvm. And maybe in time they will get much better.. I don't know.. Anyway, if anyone still has an idea of, what I might be doing wrong, I would appreciate your opinion...